KR100869613B1 - Integrated over voltage protection circuit in LED driver - Google Patents

Integrated over voltage protection circuit in LED driver Download PDF

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Publication number
KR100869613B1
KR100869613B1 KR1020070024819A KR20070024819A KR100869613B1 KR 100869613 B1 KR100869613 B1 KR 100869613B1 KR 1020070024819 A KR1020070024819 A KR 1020070024819A KR 20070024819 A KR20070024819 A KR 20070024819A KR 100869613 B1 KR100869613 B1 KR 100869613B1
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led
voltage
protection circuit
overvoltage
switch unit
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KR1020070024819A
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Korean (ko)
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KR20080083935A (en
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한재현
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엘지이노텍 주식회사
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/238—Arrangement or mounting of circuit elements integrated in the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/001—Arrangement of electric circuit elements in or on lighting devices the elements being electrical wires or cables
    • F21V23/002—Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/10—Safety devices structurally associated with lighting devices coming into action when lighting device is overloaded, e.g. thermal switch
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Abstract

본 발명은 복수가 설치된 LED들 중 하나에 과전압이 걸리게 되는 경우에 이를 감지하여 전체모듈을 일시에 정지시킴으로써 사고의 파급을 방지하기 위한 보호회로에 관한 것이다. 본 발명은 PWM 제어신호를 인가받아 일정 듀티비의 PWM 신호를 출력하여 각각의 LED에 구동전압을 제공하는 적어도 하나 이상의 FET, 과전압 검출신호를 인가받을 때 각각의 상기 FET들을 구동 오프시키기 위해 각 PWM제어부에 각각 설치된 차단스위치부, 상기 LED에 각각의 입력된 전압을 검출하여 각 검출된 전압 중 어느 하나의 전압이 미리 설정된 기준전압보다 클 경우에 상기 과전압검출신호를 출력하는 검출스위치부를 포함하여 구성되는 LED 구동드라이버에서의 통합 과전압보호회로를 제공한다. 본 발명에 의하면, 종래의 LED 드라이버가 각각의 RGB LED로 나뉘어져 있던 것을 하나의 드라이버로 통합함으로써 이를 통해 부품수의 절감과 모듈사이즈의 축소 등의 효과가 있다.The present invention relates to a protection circuit for preventing the spread of an accident by detecting when an overvoltage is applied to one of the plurality of LEDs installed and stopping the entire module temporarily. According to the present invention, at least one or more FETs are supplied with a PWM control signal to output a PWM signal having a predetermined duty ratio to provide driving voltages to respective LEDs, and each PWM is driven to drive off the respective FETs when an overvoltage detection signal is applied. A blocking switch unit installed in the control unit, and a detection switch unit detecting the input voltage to the LED and outputting the overvoltage detection signal when any one of the detected voltages is greater than a preset reference voltage. It provides integrated overvoltage protection circuit in LED driver. According to the present invention, by integrating a conventional LED driver divided into each RGB LED into a single driver, there is an effect of reducing the number of parts and reduction of the module size through this.

과전압보호회로, LED, 구동드라이버, 통합 Overvoltage Protection Circuit, LED, Driver Driver, Integrated

Description

ＬＥＤ 구동드라이버에서의 통합 과전압보호회로{Integrated over voltage protection circuit in LED driver}Integrated over voltage protection circuit in LED driver

도 1은 종래의 과전압보호회로를 도시한 회로도이다.1 is a circuit diagram showing a conventional overvoltage protection circuit.

도 2는 본 발명의 과전압보호회로를 도시한 회로도이다.2 is a circuit diagram showing an overvoltage protection circuit of the present invention.

도 3은 본 발명의 다른 실시예를 도시한 회로도이다.3 is a circuit diagram showing another embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for main parts of the drawings>

120: LED 130: LPF(Low Pass Filter)120: LED 130: LPF (Low Pass Filter)

140: 차단스위치부140: disconnect switch unit

본 발명은 LED 구동드라이버에서의 통합 과전압보호회로 관한 것이다.The present invention relates to an integrated overvoltage protection circuit in an LED driver.

근래에 디스플레이 산업이 활성화되면서 기존에 사용되었던 FL종류의 백라이트 광원 대신에 LED와 같은 고휘도, 고수명, 높은 색 재현성의 특성을 가지는 소자가 많이 사용되고 있다. RGB LED는 100% 이상의 색재현성이 가능해 기존 냉음극형광램프(CCFL)보다 고화질이 가능하다는 장점이 있다. 또 CCFL과 달리 유해물질이 없으며 여기에 응답속도가 빨라 동영상 잔상 문제도 해결할 수 있다.In recent years, as the display industry is activated, devices having high brightness, long life, and high color reproducibility characteristics, such as LEDs, are being used instead of the FL type backlight source. RGB LED is capable of more than 100% color reproducibility, which makes it possible to achieve higher image quality than conventional cold cathode fluorescent lamps (CCFL). In addition, unlike CCFL, there are no harmful substances and the response speed is fast, which can solve the problem of image retention.

이와 같이, LED를 사용한 LCD 백라이트 유닛에서는 LED에 흐르는 전류를 일정하게 유지시켜줄 수 있는 구동회로가 필요한데, 이를 위해 일반적으로 PWM방식의 부스트컨버터가 사용되고 있다.As such, in the LCD backlight unit using the LED, a driving circuit capable of maintaining a constant current flowing through the LED is required. For this purpose, a boost converter of a PWM method is generally used.

도 1은 종래의 부스트컨버터를 사용한 과전압보호회로를 도시한 회로도이다. 부스트컨버터는, 직류전원(V1)의 (+)단에 인덕터(L1)와 다이오드(D1)가 직렬로 연결되고 다이오드(D1)와 직류전원(V1)의 (-)단 사이에 커패시터(C1)와 LED(12)가 서로 병렬연결된다. 인덕터(L1)와 다이오드(D1)의 접속노드와 직류전원(V1)의 (-)단 사이에 스위치(Q1)가 직렬로 연결된다. PWM제어부은 스위치(Q1)의 on-off의 듀티비를 조정한다. 스위치(Q1)는 도1에 도시된 바와 같이 MOSFET이 사용될 수 있으며 상기 MOSFET의 게이트 전압을 조정하여 스위치로 사용할 수 있다.1 is a circuit diagram showing an overvoltage protection circuit using a conventional boost converter. The boost converter has an inductor L1 and a diode D1 connected in series to the positive terminal of the DC power supply V1 and a capacitor C1 between the diode D1 and the negative terminal of the DC power supply V1. And LED 12 are connected in parallel with each other. A switch Q1 is connected in series between the connecting node of the inductor L1 and the diode D1 and the negative terminal of the DC power supply V1. The PWM controller adjusts the duty ratio of the on-off of the switch Q1. As shown in FIG. 1, the switch Q1 may be a MOSFET and may be used as a switch by adjusting the gate voltage of the MOSFET.

스위치(Q1)가 on인 경우에, 직류전원(V1)에서 공급되는 전류는 인덕터(L1) 및 스위치(Q1)를 통해 흐르게 되고 인덕터(L1)에는 에너지가 저장된다. 스위치(Q1)가 off인 경우에는 직류전원(V1)과 인덕터(L1)에 축적된 에너지의 합이 다이오드(D1)를 통과하여 LED(12)에 전달된다. 이때, LED(12)로 전달되는 전압은 평활 커패시터(C1)에 의해 평활되어 전달되며, 그 값은 입력전압(V1)보다 크거나 같게 된다.When the switch Q1 is on, the current supplied from the DC power supply V1 flows through the inductor L1 and the switch Q1 and energy is stored in the inductor L1. When the switch Q1 is off, the sum of the energy stored in the DC power supply V1 and the inductor L1 passes through the diode D1 and is transmitted to the LED 12. At this time, the voltage delivered to the LED 12 is smoothed and transferred by the smoothing capacitor C1, and the value is greater than or equal to the input voltage V1.

이와 같이 부스트컨버터를 이용한 LED 구동회로에서, LED(12)가 개방되는 경우, LED로 전류가 흐르지 않게 되므로 LED의 양단 전압은 인덕터 역기전력 관계로 정상 동작시의 인덕터 전압보다 수 배에 해당하는 전압에 입력전압이 더하여 인가 되기 때문에 과전압에 따른 소자의 파손이 발생하게 된다. 그러므로 이렇게 과전압이 인가되는 경우에 R1저항과 R2저항 사이의 전압이 비교기(10)의 (+)단자로 입력되어 (-)단자의 기준전압(V2)과 비교하여 기준전압(V2)보다 높은 전압이 인가되는 경우에 차단스위치(Q2)가 on되어 PWM단의 신호유입을 차단한다.As described above, in the LED driving circuit using the boost converter, when the LED 12 is opened, current does not flow to the LED, so the voltage at both ends of the LED is equal to several times the voltage of the inductor during normal operation due to the inductor counter electromotive force. Since the input voltage is applied in addition, breakage of the device occurs due to overvoltage. Therefore, when an overvoltage is applied in this way, the voltage between the R1 and R2 resistors is input to the (+) terminal of the comparator 10 and is higher than the reference voltage (V2) compared to the reference voltage (V2) of the (-) terminal. In this case, the cutoff switch Q2 is turned on to block the signal inflow of the PWM stage.

그러나 상기와 같이 회로를 구성하기 위해서는 RGB LED군에 따라 각각의 피드백 신호를 얻어야 하며 비교기와 그 주변회로가 각 LED군마다 형성되어야 한다. 이로인해 재료비가 상승되며 부품이 많아지기 때문에 모듈의 크기 또한 커지게 되는 문제점이 있다.However, in order to configure the circuit as described above, each feedback signal must be obtained according to the RGB LED group, and a comparator and a peripheral circuit must be formed for each LED group. As a result, the cost of the material increases and the size of the module increases because there are many parts.

따라서 본 발명은, 각 LED군에서 어느 한곳에서 과전압이 흐르게 되는 경우에 이상전압의 유입을 차단한다.Therefore, the present invention blocks the inflow of an abnormal voltage when an overvoltage flows in any one of the LED groups.

본 발명은, PWM 제어신호를 인가받아 일정 듀티비의 PWM 신호를 출력하여 각각의 LED에 구동전압을 제공하는 적어도 하나 이상의 FET, 과전압 검출신호를 인가받을 때 각각의 상기 FET들을 구동 오프시키기 위해 각 PWM제어부에 각각 설치된 차단스위치부, 상기 LED에 각각의 입력된 전압을 검출하여 각 검출된 전압 중 어느 하나의 전압이 미리 설정된 기준전압보다 클 경우에 상기 과전압검출신호를 출력하는 검출스위치부를 포함하여 구성되는 LED 구동드라이버에서의 통합 과전압보호회 로를 제공한다.According to an embodiment of the present invention, at least one or more FETs for supplying a driving voltage to each LED by receiving a PWM control signal and outputting a PWM signal having a certain duty ratio, each of the respective FETs for driving off when an overvoltage detection signal is applied A blocking switch unit installed in each of the PWM control units, and a detection switch unit detecting the input voltage to the LED and outputting the overvoltage detection signal when any one of the detected voltages is greater than a preset reference voltage. It provides an integrated overvoltage protection circuit in the configured LED driver.

이하, 본 발명의 바람직한 실시 예를 첨부된 도면들을 참조하여 상세히 설명한다. 우선 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 대해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명을 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

도 2는 본 발명의 과전압보호회로를 도시한 회로도이다. 일반적으로 LCD백라이트에 적용되는 LED(120a,120b,120c)는 백색광을 생성하기 위해 적색, 녹색, 청색의 빛을 생성하는 복수개의 LED(120a,120b,120c)를 포함한다. 도 2에 도시된 바와 같이, 적색, 녹색, 청색 LED(120a,120b,120c)는 적어도 하나 이상의 LED(120a,120b,120c)로 이루어질 수 있으며, 각각의 LED(120a,120b,120c)에는 부스트컨버터를 이용하여 전원을 제공한다.2 is a circuit diagram showing an overvoltage protection circuit of the present invention. In general, the LEDs 120a, 120b, and 120c applied to the LCD backlight include a plurality of LEDs 120a, 120b, and 120c that generate red, green, and blue light to generate white light. As shown in FIG. 2, the red, green, and blue LEDs 120a, 120b, and 120c may be formed of at least one LED 120a, 120b, and 120c, and each LED 120a, 120b, and 120c may have a boost. Provide power using a converter.

각 LED(120a,120b,120c)의 에노드단에서 검출된 전압은 LED(120a,120b,120c) 에노드단의 하단에 설치된 각각의 LPF(Low Pass Filter,130a,130b,130c)를 통하여 노이즈가 제거되고, 노이즈가 제거된 각각의 전압은 LPF(130a,130b,130c) 하단에 설치된 다이오드(D14,D15,D16)를 거치면서 전압이 정류되어 저항(R14)의 입력 노드에서 합쳐진다.The voltage detected at the anode end of each of the LEDs 120a, 120b, and 120c is noiseed through each of the low pass filters 130a, 130b, and 130c installed at the bottom of the anode end of the LEDs 120a, 120b, and 120c. Are removed, and the respective noise-removed voltages are rectified by diodes D14, D15, and D16 disposed under the LPFs 130a, 130b, and 130c, and are combined at the input node of the resistor R14.

검출스위치부(140)는 상기와 같이 각 LED 부스트컨버터에서 검출된 전압과 사전에 설정된 기준전압(V14)과 비교하여, 검출 전압이 기설정된 기준전압(V14)보 다 큰 경우 스위칭역할을 하는 트랜지스터(Q17)에 의하여 기준전압(V14)를 이미터단자에 출력한다. 이렇게 출력된 기준전압(V14)는 차단스위치부(Q14,Q15,Q16)의 게이트단에 인가됨으로써 PWM제어부에서 나온 전류가 드레인단에서 소스단으로 흐르게 된다. 이로인해 스위치(Q11,Q12,Q13) 게이트단의 전위가 낮아지게 되어 더 이상 정상전압의 출력이 차단됨으로써 과전압으로 인한 회로 파손 등의 문제를 방지할 수 있게 된다.The detection switch unit 140 compares the voltage detected by each LED boost converter with the preset reference voltage V14, and performs a switching role when the detection voltage is larger than the preset reference voltage V14. The reference voltage V14 is output to the emitter terminal by Q17. The output reference voltage V14 is applied to the gate terminals of the blocking switch units Q14, Q15, and Q16 so that current from the PWM control unit flows from the drain terminal to the source terminal. As a result, the potential of the gate terminals of the switches Q11, Q12, and Q13 is lowered, and the output of the normal voltage is no longer interrupted, thereby preventing problems such as circuit damage due to overvoltage.

즉, 각 RGB LED 중 어느 한 곳에서 단락이 발생하는 경우, 검출스위치(140)는 기준전압(V14)를 출력하여 스위치(Q11,Q12,Q13) 게이트단의 전위를 낮추어 정상전압의 출력을 차단하여 전체모듈을 일시에 정지시킴으로써 사고의 파급을 방지한다.That is, when a short circuit occurs in any one of the respective RGB LEDs, the detection switch 140 outputs the reference voltage V14 to lower the potential of the gate terminals of the switches Q11, Q12, and Q13 to block the output of the normal voltage. By stopping the whole module temporarily, the spread of the accident is prevented.

검출스위치부(140)는 시정수 선정을 위한 저항(R4,R5)과 스위칭역할을 하는 트랜지스터(Q17)로 이루어져 있고, 트랜지스터(Q17)는 부스트컨버터에서 검출된 전압이 입력되는 베이스단자, 상기 기준전압이 입력되는 컬렉터단자, 상기 부스트컨버터에서 검출된 전압이 상기 기준 전압보다 클 경우에 과전압검출 신호를 출력하는 이미터단자로 구성되어 있다.The detection switch unit 140 includes resistors R4 and R5 for selecting time constants, and a transistor Q17 serving as a switching role. The transistor Q17 includes a base terminal to which a voltage detected by the boost converter is input. And a collector terminal for inputting a voltage and an emitter terminal for outputting an overvoltage detection signal when the voltage detected by the boost converter is greater than the reference voltage.

차단스위치부(Q14,Q15,Q16)는 MOSFET이 사용될 수 있으며 상기 MOSFET의 게이트 전압을 조정하여 스위치로 사용할 수 있다.As the cutoff switch units Q14, Q15, and Q16, a MOSFET may be used and the gate voltage of the MOSFET may be adjusted to be used as a switch.

도 3은 본 발명의 다른 실시예를 도시한 회로도이다. 본 발명의 한 실시예인 도 2의 차단스위치부(Q14,Q15,Q16)를 하나의 차단스위치(Q18)를 이용하여 구성한 것이다.3 is a circuit diagram showing another embodiment of the present invention. The cutoff switch portions Q14, Q15 and Q16 of FIG. 2, which is an embodiment of the present invention, are configured using one cutoff switch Q18.

이상의 설명은 본 발명의 기술 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 다양한 수정 및 변형이 가능할 것이다. 따라서, 본 발명에 개시된 실시예들은 본 발명의 기술 사상을 한정하기 위한 것이 아니라 설명하기 위한 것이고, 이러한 실시예에 의하여 본 발명의 기술 사상의 범위가 한정되는 것은 아니다. 본 발명의 보호 범위는 아래의 청구범위에 의하여 해석되어야 하며, 그와 동등한 범위 내에 있는 모든 기술 사상은 본 발명의 권리범위에 포함되는 것으로 해석되어야 할 것이다.The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

이상에서 설명한 바와 같이 본 발명에 의하면, 종래의 LED 드라이버가 각각의 RGB LED로 나뉘어져 있던 것을 하나의 드라이버로 통합함으로써 이를 통해 부품수의 절감과 모듈사이즈의 축소 등의 효과가 있다.As described above, according to the present invention, it is possible to reduce the number of components and reduce the module size by integrating a conventional LED driver divided into respective RGB LEDs into one driver.

Claims (5)

PWM 제어신호를 인가받아 일정 듀티비의 PWM 신호를 출력하여 각각의 LED에 구동전압을 제공하는 적어도 하나 이상의 FET;At least one FET receiving a PWM control signal and outputting a PWM signal having a predetermined duty ratio to provide a driving voltage to each LED; 과전압 검출신호를 인가받을 때, 상기 PWM 제어신호를 접지로 흘려보내 상기 FET들을 구동 오프시키는 각 PWM 제어부와 FET의 게이트단 사이에 각각 설치된 차단스위치부;A blocking switch unit disposed between each PWM control unit for driving off the FETs by flowing the PWM control signal to ground when an overvoltage detection signal is applied; 상기 LED에 각각의 입력된 전압을 검출하여 각 검출된 전압 중 어느 하나의 전압이 미리 설정된 기준전압보다 클 경우에 상기 과전압검출신호를 출력하는 검출스위치부;A detection switch unit that detects each input voltage to the LED and outputs the overvoltage detection signal when any one of the detected voltages is greater than a preset reference voltage; 를 포함하는 LED 구동드라이버에서의 통합 과전압보호회로.Integrated overvoltage protection circuit in the LED drive driver comprising a. PWM 제어신호를 인가받아 일정 듀티비의 PWM 신호를 출력하여 각각의 LED에 구동전압을 제공하는 적어도 하나 이상의 FET;At least one FET receiving a PWM control signal and outputting a PWM signal having a predetermined duty ratio to provide a driving voltage to each LED; 과전압 검출신호를 인가받을 때, 상기 PWM 제어신호를 접지로 흘려보내 상기 FET들을 구동 오프시키는 각각의 PWM 제어신호가 모여 입력되도록 설치된 차단스위치;A cutoff switch provided so that each PWM control signal for driving off the FETs is inputted when the overvoltage detection signal is applied; 상기 LED에 각각의 입력된 전압을 검출하여 각 검출된 전압 중 어느 하나의 전압이 미리 설정된 기준전압보다 클 경우에 상기 과전압검출신호를 출력하는 검출스위치부;A detection switch unit that detects each input voltage to the LED and outputs the overvoltage detection signal when any one of the detected voltages is greater than a preset reference voltage; 를 포함하는 LED 구동드라이버에서의 통합 과전압보호회로.Integrated overvoltage protection circuit in the LED drive driver comprising a. 제1항 또는 2항에 있어서, 각 LED의 애노드단에 각각 설치되고, 상기 LED단에서 검출된 전압의 노이즈를 제거하고 상기 검출스위치부로 전압을 인가하기 위한 LPF(Low Pass Filter)를 포함하는 LED 구동드라이버에서의 통합 과전압보호회로.The LED of claim 1 or 2, wherein the LED is provided at an anode end of each LED, and includes a low pass filter (LPF) for removing noise of the voltage detected at the LED end and applying a voltage to the detection switch unit. Integrated overvoltage protection circuit in drive driver. 제1항 또는 2항에 있어서, 상기 검출스위치부는The method of claim 1, wherein the detection switch unit 부스트컨버터에서 검출된 전압이 입력되는 베이스단자,A base terminal to which the voltage detected by the boost converter is input, 상기 기준전압이 입력되는 컬렉터단자,A collector terminal to which the reference voltage is input, 상기 부스트컨버터에서 검출된 전압이 상기 기준 전압보다 클 경우에 과전압검출 신호를 출력하는 이미터단자로 구성된 트랜지스터Transistor composed of an emitter terminal for outputting an overvoltage detection signal when the voltage detected by the boost converter is greater than the reference voltage 를 포함하는 LED 구동드라이버에서의 통합 과전압보호회로.Integrated overvoltage protection circuit in the LED drive driver comprising a. 제4항에 있어서, 상기 검출스위치부는The method of claim 4, wherein the detection switch unit 전압을 검출하기 위한 분배저항을 더 포함하는 LED 구동드라이버에서의 통합 과전압보호회로.An integrated overvoltage protection circuit in the LED driver which further comprises a distribution resistor for detecting a voltage.
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